Diamond holder with gauging means



March 24, 1953 w. MUENCH 2,632,433

DIAMOND HOLDER WITH GAUGING MEANS Filed March 5, 1947 8 v W J] IILEQEI-2/ 9 I P 5 1 INVENTOR.

' I ilZiefi/Tfa en v Patented Mar. 24, 1953 DIAMOND HOLDER WITH GAUGINGMEANS Walter Muench, Newark, N. J assignor to Walter Muench,Incorporated, Newark, N. J a corporation of New Jersey Application March5, 1947, Serial No. 732,623

1 v This invention relates to surface grinding wheels in which concaveor convex radii are formgenerated by a diamond studdedshank-proper whichis held in a fixture and in the construction of which the mechanicalfunctions are so arranged that thediamond holding shank-proper can beraised or lowered to produce different sizes of concave or convex radiiin the. grinding whee1 periphery.

To predeterminethe size of a radius desired in a grinding wheelperiphery, the height of the diamond point in the shank-proper isadjusted relatively to a fixed pivot height in a stationary right anglefixture, which consists of a fiat base plate that isheld tight to amagnetic chuck, whereas in the upright column a swinging arm is held ina close fitting bearing and it is in this arm that thediamond-shank-proper can be moved up or .down and clamped in place afterthe correct height above the pivot point has been obtained by measuringfrom the bottom surface of the swinging arm over the point of thediamond, held in the shank-proper.

A micrometer is always used in this measuring procedure to set thediamond point at the right height to dress the grinding wheel for acertain radius and it is by this applied screwpressure of the micrometerspindle on the cutting point of the diamond that damage can easily bedone to the small frail diamond with resultant great inaccuracies in theform-grinding of machine parts, tools,molds and dies.

'To overcome this malpractice to apply micrometer pressure on thediamond point is the object of my invention.

To enable others, skilled in the art to fully comprehend the underlyingfeatures of my invention, a drawing, depicting a preferred form has beenannexed as a part of this disclosure and.

in this drawing similar reference characters denote corresponding partsthroughout the several views, of which Fig. 1 is a side view of a radiusdressing fixture with the shank-proper, holding the diamond and theplunger with measuring plate, in place.

Fig. 2 is a front view of the same wheel dresser as'shown in Fig. l inthe direction from X to Y.

Fig. 3 is an illustrative angular view of a modified form of a diamondholding shankproper.

Referring now to the drawing, I designates the baseplate, which, when inoperation, is held tight to a magnetic chuck and 2 is a right-angleupright plate which is rigidly fastened to the base plate I. Anextension 3 is solidly cast to 2.

'7 Claims. (Cl. -11) .2 A shaft 4 reaches through 2 and 3, havingattached to it at one end the hand-wheel 5, while the other end of. theshaft is solidly fastened to the arm 5, which can be swung by turningthe hand-whee1 5 through an arc of At the extreme end of arm 6 the shankI is held'in place by a set-screw ,8. To this shank I is cast theextension 9 which holds in one end the diamond lil, while the oppositeend is provided with an adjustable heel in the formof a threaded discpin I I. To the sliding plunger 12 is attached the measuring plate I3,which rests on top of the disc pin H and illustrates the very positionwhen measurements for the height of the diamond are taken toform-generate whatever radius is desired in the periphery of thegrinding wheel. As regards Fig. 3, here the measuring base is the fixedraised heel l5, which of course is non-j adjustable, but is held at thesame height as' the highest point of the diamond, held in tool i4.

My invention consists in the provision of the raised heel l5 and amodified form of this is the threaded disc-pin H, which is adjusted toprecisely the same height as that of the highest point of the diamond I0in Fig. 1, so that, when plate [3 rests on top of thedisc-pin H and ameasurement is taken with a micrometer, the diamond remains free. andclear of any pressure contact and consequently cannot be damaged orwrecked under the screw pressure of the micrometer when carelesslyhandled, or when the contact surfaces of the micrometer, that means theanvil and spindle, are not perfectly parallel; which is only too oftenthe case with micrometers that have been in use for a number of years.

The tool shown in Figs. 1 and 2, singled out by characters I, 9, l0 andis most suitable fo dressing any size of a convex radius.

However, the tool shown in Fig. 3, and desig-. nated I4, is usedpreferably only for small concave radii in the sizes from tie" up to Theindividual tool sizes are advisably made in steps of 4,". For thesesmall concave radii forming tools the fixed heel I5 is provided in placeof the disc-pin H for measuring over; though the adjustabledisc-pin-arrangement can also be applied whereby the price of the toolwould increase considerably. It is of course understood that the heel I5is ground to the same height as the highest point of the diamond is, intool I l. When the diamond wears, the heel E5 can be ground down to thesame level of the diamond point. The wear of the diamond is checked'witha sensitive indicator or a shadowgraph. If the check-up shows a wear of.001 or more of the diamond, the heel need not necessarily be grounddown to compensate for the difference of the height of the heel 15.Really all that is required. is to mark the difierence in height betweenthe diamond and heel i and allow for the dinerence in the depth of cutwhen dressin the wheel.

It shouldbementionedthat the adjustable discpin H in Fig. 1 must bereset as the diamond Wears down in use. A set-screw will hold thedisc-pin H secure in place after adjustments have been made.

It should also be noted that the sliding plunger [2 with its attachedmeasuring plate i3 is taken out of the fixture after the correct heightof the diamond has been obtained by measuring with a micrometer aspreviously explained. The removal of the plunger-unit is necessaryforthe operation of the fixture under a wheel.

While I have illustrated and described my invention with some degree ofparticularity, I realize that in practice various alterations thereinmay be made. I therefore reserve the right and privilege of changing theform of the. details and construction or otherwise altering thearrangement of the correlated parts without departing from the spirit ofthe invention or the scope of the appended claims.

Having thus described my invention, what I claim as new and desire tosecure by United States Letters Patent is:

1. In a diamond holder for form dressing grinding wheels, a support armswingably mounted for swinging movement relative toa wheel which is tobe dressed, a diamond holder mounted on and movable with said arm, adiamond carried by said holder and having a wheel dressing extremityprojecting away from the holder for presentation against a wheel whichis to be dressed, a gaging heel carried by, said holder and spaced toone side of the diamond thereon, said support arm having a gagingsurface lying in a plane paralleling' the axis about which the supportarm is swingable, and said gaging heel having a gaging surface facingaway from the holder and at a common level with the wheel dressingextremity oi the diamond in a plane paralleling the other said planewhereby a gaging means can be applied to. thegaging surface of thesupport arm and the gaging surface ofrthe heel so that by determiningthe spacing of saidgaging surfaces the accuracy of the degree ofprojection of the wheel dressing extremity of the diamond can be gagedwithout direct contact of the gaging means with the dressing extremityof the diamond.

2. Apparatus as defined in claim 1 in which the diamond holder isadjustably mounted on the support arm to enable variation of the degreeof projection of the wheel dressing extremity of the diamond from saidsupport arm, and wherein the gaging heel is adjustably mounted on thediamond holder to enable variation in the degree of projection of thegaging surface of said heel to compensate for Wearing of the wheeldressing extremity of the diamond.

3. Apparatus as defined in claim 1 in which the diamond holder isadjustably mounted on the support arm to enable variation of the degreeof projection of the dressing extremity of the diamond from said supportarm, and wherein the gaging heel is adjustably mounted on the diamondholder to enable variation in the degree of projection'of the gagingsurface of said heel to compensate for wearing of the dressing extremityof the diamond, said adjustable mounting 0 Number of the diamond holdercomprising a mounting shank slidably received in the support arm andprojecting from said holder intermediately of the positions of thediamond and the gaging heel.

4. A Work dressing device comprising a longitudinal mounting shank, anarm carried at one end of the shank and projecting in a directionperpendicular tothe axisfot said shank, a; diamond projecting from thearm in a-directio'n paralleling the axis of said shank, said arm havinga bore paralleling the axis of the shank and spaced to one. side of thediamond, a gaging heel having a gaging face facing away from said arm inthe direction in'whichjthe diamond projects from said arm and asha'nkadjustably mounted in said bore so that the gaging face can be placed inaccurate. alignment with the dressing surface of the diamond.

5. A 'work dressing device as defined in claim 4 in which the mountingshank projects from the arm intermediately of the ends thereof, thediamond being mounted adjacent one end of: said arm, and the gage heelbeing mounted adjacent. the other end of said arm.

6. A work dressing device comprising a longi-.

tudinal mounting shank, an arm carried at one end of the shank andprojecting in a direction perpendicular to the axisof said shank,adiamond and a gaging heel arranged side by-side in spaced relation onthe arm and projecting substantially identical distances and in likedirection therefrom, that portion of the. arm extending between theshank and the end adjacent which the diamond ismounted having convergingand oppositely concaved side portions which will clear a wheel beingdressed as the. arm is rocked about an axis generally paralleling a linerunning. through the length of the arm.

7. A work dressing. device comprisinga longitudinal mounting shank, anarm' carried at one.

end of the shank and projecting in a direction perpendicular to the axisof said shank, a diamond and a gaging heel arranged. side by side.

in spaced relation on the arm and. projecting substantially identicaldistances and in. like direction therefrom,"thatfportion of the armextending between the shank and theend'adjacent which the diamond ismounted having converging and oppositely concaved sideportions whichwill clear a wheel being dressedasthe arm. isrocked about an axisgenerallylparallelingL aline running through the length of thearm, andthe gaging heel being rigidly supported in position for beingintersected by the axis of the shank.

WALTER MUENCH.

REFERENGES CITED UNI-TED STATES-PATENTS.

Name Date. Hanson May 25, 1926 Number Greig June .12, 1945 Thompson July.16,:19,46. Machemov .Nov. 19, 1946 FOREIGN PATENTS Country. Date475,096 554,875

Great Britain July 22 1943 Winter July 2, 1935 Parker .Aug. 23, 1938-Great Britain, Nov. 8,1937-

